Sewing machine



Aug 28, 1945.

M. PEDERSEN SEWING MACHINE Filed July 13, 1940 2.Sheets-Sheet l INVENTOR N E 5 W E D E P Y 5 mo A M B Aug. 28,1945. M. PEDERSEN 2,333,677

' SEWING MACHINE Filed July 13, 1940 2 Sheets-Sheet 2- Patented Aug. 28, 1945 UNITED STATES PATENT OFFICE SEWING MACHINE I Mathias Pedersen, Brooklyn, N. Y., assignor to American Machine and Foundry Company, a corporation of New Jersey Application July 13, 1940, Serial No. 345,352

14 Claims. (01. 112-7471) This invention relates to sewing machines and more particularly to improvements in sewing machines of the type using a double pointed needle having-an eye located between the points, and means for projecting the needle with a thread back and forth through material to be sewed.

In machines of this-type, which usually employa. relatively short thread, the length of which diminishes as each stitch is formed, due to the pulling of the thread through the material being sewed, it is advisable to provide some means for supportingthe thread so that it will not become tangled or frayed excessively by'and durin the pulling operation. Accordingly, it is an object of my invention to provide improved mechanism for properly disposing the thread relative to the pulling device and the means which propel the needle back and forththrough the material to be sewed.

' It is a further object of my invention to provide improved thread disposing mechanism which may include a drum acting as a receiving surface for thread being pulled through material by a thread puller, and furnish the drumwith a series of slots for guiding the free end of the thread into mechanism for properly positioning the thread relative to the thread puller and needle.

It is an additional object of my invention to travel of the puller a series of slots which direct the thread into further thread guiding mechanism for the formation of proper stitches. I

Due to the fact that during the pulling of the thread in the formation of stitches, the tip of the free end often becomes somewhat frayed with the result that some difficulty may be experience in directing the thread into the guiding means used for disposing the thread in proper relationship to thethread operating instrumentalities of the machine. Accordingly, my invention also consists in the provision of a thread receiving surface, such' as a stationary drum, about which thread is disposed by a thread puller and a ledge forming a part thereof or associated therewith together with slots formed in a part of the surface of the drum for directing the thread downwardly off th ledge portion of the drum, and thereby substantially eliminate improper thread disposition, such as locking of thread lengths on the ledge of the drum, especially in instances where the end of the thread becomes frayed and tends to prevent movement of the thread from the ledge.

My invention further consists in the provision of a guide plate provided with a substantially L-shaped slot, the opening end of which is located adjacent the thread guide ledge of the drum mechanism, which acts as a guide in disposing the thread with respect to the thread puller and needle.

It is an added object of my invention to provide thread guiding means associated with the stationary drum mechanism about which thread is disposed by the thread puller and slots in a portion of the drum mechanism for directing the free end of the thread downwardly onto the thread receiving ledge of the drum for lateral guiding during the stitching operation.

With these and other objects not specifically mentioned in View, the invention consists in certain combinations and constructions which will be hereinafter fully described, and then set forth in the claims hereunto appended.

In the accompanying drawing, which forms a part of this specification, and wherein the several reference characters designate the same orlike of Figure 1 showing the cam actuated braking mechanism and its relation to the thread guiding and supporting mechanism;

Figure 3 is an enlarged detail view of a portion of the drum mechanism taken on line 33 of Figure 3-;

Figure 4 is a detail view taken on line 4-4 of Figure 1 showinga part of the drum which is provided witha series of cut-out porti0ns;'

Figure 5 is a detail view showing the thread puller engaging the front loop of the thread; and Figure-6 is a partial side view partlyin section showing a detail of the thread guiding drum.

Referring to the drawings, Figure 1 shows a threa puller 202 which may be similar in construction and operation as shown in co-pending application, Serial No. 289,907, filed August 12, 1.939, by C. W, Johnson, for Sewing machine, which has matured into Patent No. 2,368,066, granted January 2,3,v 1945. According to the disclosure in said application, thread puller 202 is by the movement of the needle 8| upwardly jaw 288 slidably supported on jaw 289 carried by lever 298 pivotally mounted on stud 388 supported by a suitable bracket (not shown). A spring 291 is secured to pin 282 of jaw 288 and pin 298 on jaw 289 and tends to hold the jaws closed. Jaw 288 is moved into and out of gripping relationship with jaw 289 by means of a lever 282 arranged to engage cam portion 285 of jaw 288 so that the jaws are' open to receive The rotation of the arm 246 and the operatic I .of puller 202 causes the thread to be guided onto drum member 389 is a substantially L shaped cylindrical member having a substantially vertical circumferential flange and a lateral circumferential flange 3 Hla'provided with a .threadre-j ceiving surface, and a tapered thread guiding face 30111. A guide member 386, which is provided with a thread trap 3| I, assists in-guiding thethread along face 381a. onto flangeor ledge 381. Groove 282a formed in thread puller 202 is complementary with guide 388 and in the movement of the thread puller 202, assists in positively directing the thread downwardly onto flange or ledge 38! due to the cooperation between the groove 282a and the guide 386 which insures that the thread cannot wander laterally but must be directed downwardly onto the flange or ledge 387. As the puller 202 travels it also positions a part of the thread B in a groove 310 formed in the lateral circumferential flange of member 309 and as its movement continues it pulls the free end F of the thread completely through the work, at which time thread gripping arms 200 and 28], which hold the'fixed end of the thread against tension, open andpermit the lower needle bar to ascend in a manner similar to that set forth in the above'referred to application. V a I At substantially the same time clampingjaws 288 and 289, which have engaged the thread as described in said application, swing upwardly and laterally in unison with the ascent of the needle bar 64, and in so doing, thread. A is caused to enter a trap 3H and is thereby disposed out of the path of the thread puller. The ascent 'of'the jaws 288 and 289 causes the thread A to be moved from flange or ledge 30! (Figure 3) into the space between a finger or transverse thread guldej3l2, and the lateral circumferential flange 348a .of drum 389. As shown in Figures 1 and 3,; thread guide -3l2 constitutesv a laterally projecting extension of member 3l3 secured to drum 308.-

Thread guide 3I2 coacts with inclined face 389d formed on the lower portion of the lateral circumierential flange 3l0aof drum 389 in guiding the thread into a guide slot 314 provided in the vertical flange or wall of the member 309 for holding the thread out of the path of puller 282. The slot 3M is formed in the vertical flangeof member 389 a sufficient height to allow the thread F to extend from needle 8| without much sag. When needle 8| has been gripped by the upper needle bar 63, the latter ascends its full stroke, descends slightly, forming a loop in the thread and dwells. Shortly before the ascent of the needle, jaws 288 and 289 are opened b cam lever 282 (Figure 2) so that the needle may draw some of the thread through the work from slot 3M. The gripper (Figure 2) consists of a cent trap 34 l.

thread -when located in the position shown in Figure 2 and discharge the same when by movement of lever 299 the jaws are positioned adja- The up and down movements of jaws 288, 289 and operation of lever 282 are controlled by means of cams (not shown) in the same i'manner as disclosed in the above mentioned copending Johnson application. Since the gripper forms no specific part of this invention further showin and description is deemed unnecessary.

As shown in Figure l, a slack formerand looper l8! mounted on an arm (notshown) moves rela: tively to the needle and upper needle bar'to pull a small quantity of the thread back through the work, guide it, andpreventformation of poor stitches. In a manner similar to;,that.shown in the above referred to application, looper l8! and a coacting member (not shown) operate in timed relation with the upper .needle barahd needle for disposing the thread relative to the needle. Finger I82 of looper 18! engages the front thread F of the loop and pulls some of the thread back through slot 314 while the coacting finger'in a manner similar to that described; in said application moves into engagement with the other portion of theloop alongside the needle, and moves it out of the path of the needle, while at the same time the. tension on the thread, pass; ing' through the eye of the needle, is lessened materially. Whenv looper 58! starts its retreat ing movement, needle bar 63 descendsand in so doing the extension of, an actuator ,member (not shown) secured to member 63 engages the curved portion of the finger (not shown) causing the same to be returned to its starting position. The jaws 288 and 289 startdescendingwith the deg scent of needle bar 63 and are returned to'their. starting position. A't'ension fingerlnotshown) disclosed in the above mentioned applicationjengages the'thread and moves" it outof thepath of the needle 8! as it descends to form its stitch and be transferred to the oppositel'needle bar". Before each transfer of the needle, -a suitable work feed mechanism (not shown) advancesthe work one stitch length. k f

Referring to Figures 1 and2, a cam actuated brush 328 serves as fadrag for the free end of the thread to control the movement from the drum and also to prevent any whippingor-tend en'cy to tangle as it is being pulled from-the I drum. The brush retains its active position as shown during the greater po-rtionof the cycle of the shaft 205. The brush 328 is carried on the upper'end of a lever 32L loosely mounted onlja stud 322 supported by a wall ofdrum member 388, the opposite end of lever 32i bein provided with a cam follower 323 engaging a canif'3 24 mounted, on shaft 205. A spring 325 havingone end attached to a stud anchored in member'QOB and its other end connecting to' a stud in lever 32L is provided to hold the cam follower 32 3'in' engagement with its cam. In its operation-the brush stays open until looper'l8l begins to move forward, say two-thirds of itsstroke in-order to pull up slack, but in order to prevent, fver- J. i will. ",2;

rum-the brush moves up to engage the thread being pulled 'andstays on from that time until the looper l8! completes its full slack pulling movement and the thread puller 202 has pulled thewloose end of the thread through the work andadisposed it on the drum. At the time of transferring the needle from the lower'to the upper needle bar, the high portion of cam 328 engages cam follower 323 and moves the brush lug 334 of member 383, its other end being. guided over rollers 335 suitably supported by a bracket of'the machine and led over a segment 336 loosely mounted on a stud 331 carried by a bracket 338 attached to pedestal 33. The end of the tape is clamped between a plate 339 and the end wall of segment 336, which is equipped with a post 340 receiving'one end of a spring 34! connecting to a post 342 anchored in bracket 338, said spring tending to ,yieldingly hold the tape against the drum.

As the thread. puller 202 positions the thread around the drum 224 and if the tail end of the loose thread should remain on the shelf 30'! on y its return travel to be pulled through the Work, the thread will be guided into the channel 343 (Figure 3) of the drum by means of guide members or shoulders 344 (Figures 1 and 4) provided in member 309. In this manner the free returning end of the thread will be guided out of the path of the oncoming thread being advanced by the puller, which might otherwise be pulled over it. Member 308 is provided with an undercut thread trap or guide portion 345 (Figure 3) which tends to keep the thread from flying out of the channel 343.

The invention above described may be varied in construction within the scope of the claims,

for the particular device, selected to illustrate receiving ledge formed thereon, an undercut thread guide located beneath said ledge, a vertical flanged element spaced from said member and provided with a substantially vertical elongated thread receiving slot. constructed and arranged to receive thread, andmeans for moving said thread from said ledge to said slot.

3. In a sewing machine having a pair of opposed needle barsfor projecting a thread and a needle through work tobe sewed, a thread puller for-pulling the, loose'end of said thread through said work, a, thread receiving mechanism positioned to receive thread pulled by said puller comprising .a pair of spaced members having laterally extending flanges, said flanges being spaced from each other, each of said flanges being constructed and arranged to. receive a portion of the thread as, it is pulled by said puller, and an undercut guide portion formed on one of said members for preventing said thread from moving upwardly from its thread receiving position.

4. Thread disposing mechanism for a sewing machine of the type described including, a thread receiving surface, means for disposing said thread .aboutsaid surface, a substantially L-shaped receiving and guiding member having a substantially vertical circumferential flange and a lateral circumferential flange associated with said surface, a substantially vertical slot formed insaid vertical flange of said member, a device spaced from and cooperating with said lateral circumferential flange of said member to form athread guide for guiding thread from said surface into said vertical slot, and means for tensioning said thread during its movement.

5. A thread receiving drum comprising a member provided with a thread receiving surface, a second member spaced from said first and provided with a vertical flange, a substantially vertical elongated slot formed in said vertical flange, and a lateral flange formed in said second member constructed and arranged to receive thread displaced laterally from said surface and guide prising a ledge, a thread puller coacting with said mechanism for disposing the loose end of said thread upon said ledge, and a thread guide forming a part of said drum mechanism having an inclined face positioned above said ledge constructed and arranged to assist in the proper handling of said thread during the action of said puller. I

2. In a sewing machine of the type having a pair of opposed needle bars for projecting a needle and a thread having a loose end back and forth through the work, a thread receiving drumlocated adjacent one of said bars comprising a substantially cylindrical member having a thread said thread towards said slot.

6. In a thread disposing mechanism for a sewing machine, a substantially cylindrical thread receiving and disposing drum comprising a thread receiving surface and a thread guide, and a thread disposing member associated with said surface, said member consisting 'of a lateral flange portion provided with a circumferential thread groove and a tapered thread guiding face adjacent to and above said thread receiving surface, and a guiding face on the underside of said member for guiding thread positioned on said receiving surface laterally therefrom.

7. In a sewing machine having apair of opposed needle bars for projecting a needle with a thread having a fixed and a loose end back and forth through work to be sewed, thread receiving meohanismpositioned adjacent one of said bars,

said mechanism including a thread receiving surface, a thread drag positioned proximate said bar and surface, and means for moving said drag in timed relation to the movement of said bars into and out of thread engaging position.

In a sewing @machine having a pair of opposed needle bars for projecting a needle with a thread having a fixed and a loose end back and forth through work to be sewed, a thread receiving surface extending from each side of one of said bars, a thread brake positioned adjacent one end of said surface, said brake comprising a lever, a brush mounted on said lever and projecting towards said surface, and means for moving said I brush to and from said surface.

9. In a sewing machine having a pair of posed needle bars for moving a needle with a. thread having a loose anda fixed end back and forth through work to be sewed, a split, substantially cylindrical thread receiving drum extending from opposite sides of one of said bars, a thread brake located between one of said bars and said drum, and means operating in timed relation to the movement of said bars for moving said brake into engagement with said thread.

, 10. In a sewing machine of the type described having a pair of opposed needle bars for projecting a needle and a thread provided with a fixed and a loose end back and forth through material to be sewed, a thread receiving mechanism located adjacent one of said bars, a thread puller for pulling the loose end of said thread through said material and depositing it on said mechanism, said thread puller being provided with a longitudinal groove on its lower face, a guide positioned adjacent .said mechanism and arranged to coact with said groove for guiding the thread pulled by said puller onto said mechanism.

11. A thread pulling device for a sewing machine. comprising an elongated head having an upper and a lower face forming a tapered thread engaging point and an elongated groove in said lower face, a supporting member mounting said head for movement into and out of engagement threaded with a thread having a loose and a fixed end through work to be sewed, thread receiving mechanism positioned adjacent one of said bars, said mechanism comprising a station ary drum provided with a lateral flange having a thread receiving surface, a thread guide located below said surface, and a transverse guide member located below and spaced from said flange and forming therewith a guide slot for controlling the lateral movement of said thread'from said thread guide into said slot.

13. Thread receiving mechanism for a sewing machine comprising a drum, spaced connected members forming said drum, one of said members being provided with a thread receiving surface, and a undercut thread trap guide, the other of said members comprising a substantially L-shaped cylindrical member with a substantially vertical flange and a circumferentially extending lateral flange, a thread guiding surface formed on said lateral flange, and guide means mounted on said L-shaped member and spaced from said lateral flange coacting with said surface for guiding thread laterally from said thread receiving surface.

14. Thread disposing mechanism for a sewing machine of the type described including, a thread receiving surface, means for disposing said thread about said surface, a substantially L-shaped thread receiving and guiding member provided with a substantially vertical flange and a lateral flange associated With said surface, said member having a generally vertical slot formed in said vertical flange, and a device spaced from and cooperating with the lateral flange of said memher to form a thread guide therebeneath for guiding thread from said surface into said vertical slot. v

MATHIAS PEDERSEN.- 

